소형원자로용 SA508 Gr.3 Cl.1 소재에 Alloy82 및 308L 분말을 사용한 레이저 클래딩의 미세구조 및 기계적 특성에 대한 연구

• Published in: 대한용접·접합학회지 Vol. 41; no. 6; pp. 429 - 439
• Main Authors: 정인철(In-Chul Jung), 최인성(Insung Choi), 이광현(Kwang-Hyun Lee), 서정(Jeong Suh), 조성우(Seong-Woo Jo), 김시홍(Shi-Hong Kim), 홍현욱(Hyun-Uk Hong)
• Format: Journal Article
• Language: Korean
• Published: 대한용접·접합학회 01.12.2023; 대한용접접합학회
• Subjects: 기계공학; Fusion line; Alloy82; STS308L; Small modular reactor; Dilution rate; Laser cladding; Powder
• ISSN: 2466-2232; 2466-2100

Laser cladding is an innovative welding method for application to small modular reactors (SMRs). Therefore, the characteristics of laser cladding were studied. A low alloy steel SA508 Gr.3 Cl.1 was used as the substrate, and powder- type Alloy 82 and STS 308L were used as the cladding materials. Although certain differences existed depending on the cladding materials, the tendencies of laser cladding were similar as a whole. The heat-affected region near the fusion line of Alloy 82 had a coarsened structure consisting mainly of lower bainite. The heat affected zone (HAZ) had a higher hardness value than the base material. The hardness of the HAZ was higher for Alloy 82 than for 308L. The 308L cladding had a carbide as a precipitate that was dispersed in the fusion line and cladding grain boundary. The dilution rates of Alloy 82 and 308L cladding within 1.5 mm from the fusion line were low levels of 3-6%. Dilution rates increased as heat input increased, but hardness values did not differ. δ-ferrite values of 308L were satisfactory, that is, more than 5 FN. Intergranular corrosion testing of the 308L cladding did not reveal any cracks. In conclusion, laser cladding could be applied to SMR manufacturing. KCI Citation Count: 0